The Analysis of Matter is one of the earliest and best philosophical studies of the new physics of relativity and quantum mechanics. Written at the time of major new developments in physics and just when quantum mechanics was being developed, Russell offers an analysis of the concepts and problems that are central to a philosophical understanding of physics, and argues for a revised concept of matter. The Analyis of Matter demonstrates the logical structure of the world and develops Russell's views on the philosophy of science out of the theories of such scientists as Einstein, Bohr and Heisenberg.